8324307: [11u] hotspot fails to build with GCC 12 and newer (non-static data member initializers)

Reviewed-by: sgehwolf

Author: Jonathan Dowland

src/hotspot/os/linux/cgroupV1Subsystem_linux.hpp

@@ -105,11 +105,11 @@ class CgroupV1Subsystem: public CgroupSubsystem {
 
   private:
     /* controllers */
-    CachingCgroupController* _memory = NULL;
-    CgroupV1Controller* _cpuset = NULL;
-    CachingCgroupController* _cpu = NULL;
-    CgroupV1Controller* _cpuacct = NULL;
-    CgroupV1Controller* _pids = NULL;
+    CachingCgroupController* _memory;
+    CgroupV1Controller* _cpuset;
+    CachingCgroupController* _cpu;
+    CgroupV1Controller* _cpuacct;
+    CgroupV1Controller* _pids;
 
     char * pids_max_val();
 

src/hotspot/os/linux/cgroupV2Subsystem_linux.hpp

@@ -51,10 +51,10 @@ class CgroupV2Controller: public CgroupController {
 class CgroupV2Subsystem: public CgroupSubsystem {
   private:
     /* One unified controller */
-    CgroupController* _unified = NULL;
+    CgroupController* _unified;
     /* Caching wrappers for cpu/memory metrics */
-    CachingCgroupController* _memory = NULL;
-    CachingCgroupController* _cpu = NULL;
+    CachingCgroupController* _memory;
+    CachingCgroupController* _cpu;
 
     char *mem_limit_val();
     char *mem_swp_limit_val();